<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<style>
		html,body{
			height: 100%;
		}
		.app{
			width: 200px;
			background-color: aqua;
			height: 100%;
		}
	</style>
	<body>
		<div class="app">
			
		</div>
	</body>
</html>